A photo posted by Kim Kardashian West (@kimkardashian) on Oct 21, 2015 at 8:57pm PDT

The rapper brought his pregnant wife to the Cinepolis Luxury Cinemas at The Promenade in Westlake, California, where Kim thought she was just being treated to a movie.

But according to E! News, Kanye secretly rented out the entire theater for a private party and viewing of Romeo and Juliet for the birthday girl and her friends and family.

'Happy birthday Keeks'

Among the guests on hand to fete the reality TV star were her sisters Kourtney Kardashian, Kendall and Kylie Jenner with her boyfriend Tyga, mum Kris Jenner, and stepdad Caitlyn Jenner.

Noticeably missing was her sister Khloé Kardashian, who has been by her estranged husband Lamar Odom's bedside since he was found unconscious at a Nevada brothel last week.

He was admitted to a Las Vegas hospital, and regained consciousness a few days later. On Monday, the basketball star was discharged and airlifted to a hospital in Los Angeles, where he is currently being treated. Khloé has stayed off social media since the incident, but took to Instagram on Wednesday to break her silence with a touching post dedicated to her older sister. "Happy birthday Keeks (Kim)!!," Khloé wrote. "I pray you know how loved and dope you are!!! You continuously amaze me by how you do it all. Thank you for always being there for everyone! Today is about you!!! Enjoy it Mrs West!!! I love you, My bestie, my sister, my rider!"

A photo posted by Khloé (@khloekardashian) on Oct 21, 2015 at 10:24am PDT

It was also reported on Wednesday that Khloé and Lamar have decided to call off their divorce. The Keeping Up With The Kardashians star filed papers in December, 2013 after four years of marriage, but the two only signed the papers this past July.

However, their divorce had yet to be finalised by a Los Angeles judge, and the new reports suggest that following the recent traumatic event, both Khloé and Lamar agreed to withdraw the divorce papers, and their request was granted by a judge and the case has been thrown out.